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What Is Credit? (And Why It Matters)

Andrea Coombes

Written by Andrea Coombes
Edited by Carolyn Kimball
Fact-checked by Dayana Yochim

March 13, 2024

You know you're supposed to have good credit, but what is credit, anyway? How does it work, and why should you care? Let's do this.

  • Credit is a powerful financial tool because it helps us get things we might need now, like a loan to buy a car or a credit card to buy a new phone, with the understanding that we'll pay later.
  • Credit is also a system companies use to assess how likely a person is to pay back a loan. That's where credit reports and credit scores come in.

Strong credit can help you reach your financial goals — and it can save you oodles of cash along the way. Credit can affect...

  • Your ability to buy a car or a house, or rent an apartment.
  • How high your interest rates are on a credit card, a car loan, or a mortgage.
  • How expensive your car or homeowners insurance will be.
  • Whether you have to pay a deposit to a cell-phone or utility company, and how big that deposit will be.
  • In some cases, credit can affect your ability to land a job.

Oh, and your next Bumble date might ask for a copy of your credit report. So there's that.

In other words, credit matters. A lot. And even though you never signed up to be in this system and maybe are wondering why you should bother playing along, here's why: If you think you might ever want to borrow money or rent an apartment or take out some type of insurance policy, it will help you enormously if your credit score is "good" or better.

Ready to test your credit knowledge? Try this quick quiz, and then read on to learn more.

Having strong credit will save you money and give you a ton of financial flexibility. The bad news is that how to build your credit from scratch and fixing credit that needs reviving is a slow process. Think sloth-slow. It's not like you can wake up one morning and decide to fix your credit by lunchtime (though major props for the enthusiasm). It means planning ahead and taking it step by step.

A quick word about the big picture: The credit system was built for companies to reduce their financial risk and improve their bottom lines. You and me — we're not the target audience. That makes this system a challenging one to deal with. There are many reasons people end up with low credit scores, and it's clear that macroeconomic forces can undermine our best efforts to get ahead. My advice? Do what you can within the existing system and resist shaming or blaming yourself for "bad credit."

check_circle Key takeaway

Credit is a major facet of maintaining our overall financial health. Because it takes time to build, it’s smart to start working on it before you need it.

The cost of bad credit

Before we get into how credit works, let's look at what credit can cost you.

When your credit score is in the lowest tier, it's jaw-droppingly more expensive to borrow money, compared to someone whose score is in the top tier. Say you bought a new car for $20,000, using a 5-year car loan. As you can see in the table below, if your credit score is 720 or higher, you'll get the lowest interest rate and lowest monthly payment.

With that 720+ score, you'll pay $2,060 less in interest over the life of the loan than someone with a score in the 660-689 range, according to the calculator at myFICO, the company that created the first credit score. And you'll pay a whopping $7,230 less than someone with a score in the 500-589 range.

The cost of a 60-month, $20,000 new-car loan

FICO score APR Monthly payment Total interest paid
720-850 5.519% $382 $2,932
690-719 6.73% $393 $3,609
660-689 9.141% $417 $4,992
620-659 11.733% $442 $6,532
590-619 15.925% $486 $9,134
500-589 17.533% $503 $10,168

Interest rates fluctuate. Data is accurate as of Oct. 27, 2022. Source:

Try running your own numbers on the myFICO loan savings calculator, which lets you choose different types of car and mortgage loans.

check_circle Key takeaway

Less-than-stellar credit can cost you, big time.

How credit works

Here's how the credit system works: When you fill out an application to borrow money from a bank or other company, that company will request your credit file from one, two or all three of the major credit-reporting companies: Experian, Equifax and TransUnion.

Experian, Equifax and TransUnion create the credit reports that companies use as a tool in their lending decisions. The data in those reports (and the credit scores derived from those reports) help lenders decide whether they think the loan applicant is likely to pay back the loan. They're gauging the risk of losing money if they offer this loan. If they do decide to lend the money, they’ll then use the borrower’s credit report (and related credit score) to determine what interest rate to charge. The higher the risk, the higher the interest rate. Put another way: the lower the credit score, the higher the interest rate.

If you're approved for the loan, the lender starts reporting the details of that loan — including the loan amount and each monthly payment — to those same credit-reporting companies.

What is a credit report?

Your credit report is a document created by Equifax, Experian or TransUnion that lists detailed information about your loans, credit card accounts, credit lines, and any bankruptcies or unpaid debts such as tax liens. A credit report is a picture of your debts, past and present, and your payment history. Your credit score is derived from your credit report.

» Go deeper: Learn more about what a credit report is.

A subsection of a sample credit report, showing a consumer auto loan, with all monthly payments made on time. Source: Experian.

A subsection of a sample credit report, showing a credit card account with a 30-day late payment in April. Source: TransUnion.

What is a credit score?

Credit scores wrangle the details of a credit report down to a three-digit number. That makes it easier for lenders and other financial companies to make fast decisions about, for example, whether to loan you money or rent you an apartment, or how much to charge you for car insurance.

» Dive deeper: Learn more about what a credit score is.

See below for how two of the most common credit scores — the FICO and the VantageScore — assign values to those three-digit numbers. (Note that a lender or landlord may have their own metrics for deciding what credit scores are top-tier, or not.)

FICO score ranges

For many FICO scores, 850 is the highest number possible. But FICO makes various score algorithms and some have a higher endpoint, so we use 800+ here.

VantageScore ranges

The idea is that if a person has a credit score of, say, 600, that means that person either doesn't have much experience paying back loans or has had some hiccups repaying loans in the past.

check_circle Key takeaway

The details of your loans and loan payments are reported to the credit-reporting companies, and those details become your credit file (aka credit report). Credit scores are based on the information in credit reports.

How are credit scores calculated?

There are many different credit score algorithms, but one of the most common is the FICO score. MyFICO, the company that created the FICO score, offers a general breakdown of the five main factors that go into calculating credit scores. Keep in mind that different scores will work slightly differently; still, this pie chart is a useful guide.

FICO score breakdown pie chart

» More: Check it out: How are credit scores calculated?

Just to make things more fun, you have more credit scores than you realize. Way, way more. An analysis in 2012 found that FICO alone was using 49 different score models. And that doesn't count other score models, such as the VantageScore.

It's impossible to know which score a lender will use when they check your credit, and sometimes lenders will use their own proprietary tools, or will average your scores from each of your three credit reports. (Each of your credit reports is different, because lenders don't always report to all three credit-reporting companies, so a score algorithm may score each of your reports differently.)

check_circle Key takeaway

We all have more than one credit score, so pick one free credit score to monitor. If it's nudging higher over time, it's likely all of your credit scores are going in the same direction. Check out our story on how to check your credit score for more info.

Easy habits to build credit

The idea of credit and how to keep an eye on your credit score can seem like a lot. But it really boils down to a few key tasks. Don't worry — you got this. Here's your checklist.

Make on-time payments. This is absolutely key to building a strong credit file. Your payment history is the biggest factor in calculating credit scores, and paying on time is the essential ingredient.

Be wary about applying for new accounts and closing old accounts. The credit score algorithms don't like lots of new activity. That said, it may make sense for you to open or close an account, and that is completely fine. Just be aware that it may ding your score temporarily.

The best practice when paying your monthly credit card bill is to pay off the entire balance every month. It's a myth that you need to carry a balance to build your credit. To repeat: You don't need to carry a balance to build credit. By paying off your balance in full, you avoid getting charged interest. That is a wonderful thing.

If you end up carrying a credit-card balance rather than paying in full every month, keep that balance as low as possible. Your credit score will take a big hit if the amount you owe is more than 30% of your credit limit. For example, if you've got a $200 credit limit, don't let more than $60 sit unpaid on the card. And to set yourself up for the best credit score, try to keep your outstanding balance to 10% or less of available credit ($20 or less on a card with a $200 limit). Or take our advice and, if possible, simply don't carry a balance at all.


myFico Education, FICO Score Models

Next steps: Explore our full series of articles to continue learning how to build your credit, or read more of our popular credit card content.

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About the Editorial Team

Andrea Coombes
Andrea Coombes

Andrea Coombes has 20+ years of experience helping people reach their financial goals. Her personal finance articles have appeared in the Wall Street Journal, USA Today, MarketWatch, Forbes, and other publications, and she's shared her expertise on CBS, NPR, "Marketplace," and more. She's been a financial coach and certified consumer credit counselor, and is working on becoming a Certified Financial Planner. She knows that owning pets isn't necessarily the best financial decision; her dog and two cats would argue this point.

Carolyn Kimball
Carolyn Kimball

Carolyn Kimball is Managing Editor for Reink Media Group and the lead editor for content on Carolyn has more than 20 years of writing and editing experience at major media outlets including NerdWallet, the Los Angeles Times and the San Jose Mercury News. She specializes in coverage of personal financial products and services, wielding her editing skills to clarify complex (some might say befuddling) topics to help consumers make informed decisions about their money.

Dayana Yochim
Dayana Yochim

Dayana Yochim has been writing (articles, books, podcasts, stirring speeches) about personal finance and investing for more than two decades, focusing on bringing clarity and the occasional comedic aside to what is often a murky, humorless topic. She’s written for NerdWallet, The Motley Fool,, Woman’s Day, Forbes, Newsweek and others, and been a guest expert on "Today," "Good Morning America," CNN, NPR and wherever they’ll hand her a mic.

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